Transcription of FOUNDATIONS FOR WIND TURBINES
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FOUNDATIONS FOR WIND TURBINES ENGR 340 Fall 2011 Jeramy C. Ashlock Assistant Professor, CCEE Vern Schaefer Professor, CCEE OUTLINE Topics Lecture # Design requirements, Foundation types 1 Overview of geotechnical engineering Soil mechanics Site investigations In-situ tests Laboratory tests 1 & 2 FOUNDATIONS for wind TURBINES , Design example 2 2 TURBINE FOUNDATION LOADS Vertical, shear forces and significant overturning moments are transmitted to foundation by tower Must be resisted within tolerances for foundation settlement and tilt Manufacturers typically specify horizontal and rotational foundation stiffness criteria Loading direction changes with wind direction and nacelle orientation Circular foundation shape is therefore optimal, but straight-sided ( octagonal, hexagonal) is easier to construct Anchors can be used to add rotational strength
•Shallow concrete “inverted tee” mat foundations ($) On weak or soft soils (bearing capacity or stiffness too low, settlements too high): • Rammed Aggregate Piers or VibroPiers under footings or mats ($$) •Soil improvement such as deep soil mixing, compaction, over-excavation & replacement with compacted lifts of aggregate ($$$)
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